Re: Canon Rebel SL1 vs Rebel XTi for Infrared photography
retrofocus wrote:
Correct, I have never used any EF-S lens in infrared myself. But if you look in the table of well and bad performing Canon lenses which I linked above, you can see that the old 18-55 and the 18-55 IS II received a good rating (with potentially some flaring issues) whereas the version I seems bad.
Those online lists are notoriously unreliable, which you can see already because they frequently contradict each other. The 18-55 is HORRIBLE in IR, trust me ... The \'CA\' is off the scale (more like special effects) and terrible hotspot. The 18-55IS I is not very good either, I would never consider using it for serious shots (I think it\'s terrific value for money for visible light though). Don\'t know about the II version but I doubt it is much better.
I\'m not just being negative about IR performance, I have some (tele) lenses that are bad according to several IR lists while they work absolutely great on my IR-450D. One of the problems is that IR performance strongly depends on where the IR filter is, in front of the lens or in front of the sensor, and what type of filter is used. It also depends on the sensor package (reflections/flare) which varies between models.
My impression is that many people who contribute to those lists don\'t know what they are doing. When I first searched online for experiences with the 15-85 in IR I found two reports that it was \'horrible\' in IR producing very unsharp images (unsharp everywhere) with huge flare. Fortunately I didn\'t trust those, they sounded a bit uninformed ;-)
Aug 22, 2014 at 01:35 PM
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